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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 11)
R$ in Millions
Dec. 31, 2020
BRL (R$)
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk R$ 21,525
Floating interest rate [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 19,167
Floating interest rate [member] | Deficit of the pension plan [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 885
Floating interest rate [member] | Debt with pension plan (forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 559
Floating interest rate [member] | Onerous concessions [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 28
Floating interest rate [member] | Loans, financings and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 17,695
Fixed interest rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,358
Up to 1 month [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,236
Up to 1 month [member] | Floating interest rate [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 98
Up to 1 month [member] | Floating interest rate [member] | Deficit of the pension plan [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 6
Up to 1 month [member] | Floating interest rate [member] | Debt with pension plan (forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 13
Up to 1 month [member] | Floating interest rate [member] | Loans, financings and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 79
Up to 1 month [member] | Fixed interest rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,138
1 to 3 months [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,546
1 to 3 months [member] | Floating interest rate [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,328
1 to 3 months [member] | Floating interest rate [member] | Deficit of the pension plan [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 11
1 to 3 months [member] | Floating interest rate [member] | Debt with pension plan (forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 25
1 to 3 months [member] | Floating interest rate [member] | Onerous concessions [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1
1 to 3 months [member] | Floating interest rate [member] | Loans, financings and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,291
1 to 3 months [member] | Fixed interest rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 218
3 months to 1 year [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,808
3 months to 1 year [member] | Floating interest rate [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,806
3 months to 1 year [member] | Floating interest rate [member] | Deficit of the pension plan [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 51
3 months to 1 year [member] | Floating interest rate [member] | Debt with pension plan (forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 115
3 months to 1 year [member] | Floating interest rate [member] | Onerous concessions [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2
3 months to 1 year [member] | Floating interest rate [member] | Loans, financings and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,638
3 months to 1 year [member] | Fixed interest rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2
1 to 5 years [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 13,557
1 to 5 years [member] | Floating interest rate [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 13,557
1 to 5 years [member] | Floating interest rate [member] | Deficit of the pension plan [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 295
1 to 5 years [member] | Floating interest rate [member] | Debt with pension plan (forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 406
1 to 5 years [member] | Floating interest rate [member] | Onerous concessions [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 11
1 to 5 years [member] | Floating interest rate [member] | Loans, financings and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 12,845
After 2026 [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,378
After 2026 [member] | Floating interest rate [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,378
After 2026 [member] | Floating interest rate [member] | Deficit of the pension plan [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 522
After 2026 [member] | Floating interest rate [member] | Debt with pension plan (forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk
After 2026 [member] | Floating interest rate [member] | Onerous concessions [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 14
After 2026 [member] | Floating interest rate [member] | Loans, financings and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk R$ 1,842